Create an Entity-Relationship Diagram with the following requirements.
(a) There are Professors (ie users) with the changeable attributes Professor_Name, Field, College, PhD_Date.
(b) There are Flubs with the unchangeable attributes Content, Purpose, Moment, Inventor (which is the creating Professor).
(c) There are Bounces where a Professor can share another Professor's Flub.
(d) Add ID attributes as necessary.
(e) Content is only text of a fixed length for version 1.0 but should be expandable later.
(f) Professors can have/be Colleagues.
(g) A Flub can get Citations by other Professors.